Mark shaved his beard and I am supportive of him no matter what because he is his own person! (The person before me said "Mark shaved his beard " but I fixed it because even though I don't like the no beard thing either, I respect that mark is his own person.)
Joan of Arc. I am a fan of Mark Twain as a writer in general, but this is my favorite of all his books. I love how he went to France and actually read the archives of her trial. I like how he used the original source materials and only then wrote his Historical Fiction.